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(2/5)*x+3/4 = (7/10)*x // - (7/10)*x
(2/5)*x-((7/10)*x)+3/4 = 0
(2/5)*x+(-7/10)*x+3/4 = 0
3/4-3/10*x = 0 // - 3/4
-3/10*x = -3/4 // : -3/10
x = -3/4/(-3/10)
x = 5/2
x = 5/2
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